package org.apache.lucene.search.spans;
/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.lucene.util.ToStringUtils;

import java.io.IOException;

/**
 * Checks to see if the {@link #getMatch()} lies between a start and end position
 *
 * @see org.apache.lucene.search.spans.SpanFirstQuery for a derivation that is optimized for the case where start position is 0
 */
public class SpanPositionRangeQuery extends SpanPositionCheckQuery {
    protected int start = 0;
    protected int end;

    public SpanPositionRangeQuery(SpanQuery match, int start, int end) {
        super(match);
        this.start = start;
        this.end = end;
    }

    @Override
    protected AcceptStatus acceptPosition(Spans spans) throws IOException {
        assert spans.start() != spans.end();
        if (spans.start() >= end)
            return AcceptStatus.NO_AND_ADVANCE;
        else if (spans.start() >= start && spans.end() <= end)
            return AcceptStatus.YES;
        else
            return AcceptStatus.NO;
    }

    /**
     * @return The minimum position permitted in a match
     */
    public int getStart() {
        return start;
    }

    /**
     * @return the maximum end position permitted in a match.
     */
    public int getEnd() {
        return end;
    }

    @Override
    public String toString(String field) {
        StringBuilder buffer = new StringBuilder();
        buffer.append("spanPosRange(");
        buffer.append(match.toString(field));
        buffer.append(", ").append(start).append(", ");
        buffer.append(end);
        buffer.append(")");
        buffer.append(ToStringUtils.boost(getBoost()));
        return buffer.toString();
    }

    @Override
    public Object clone() {
        SpanPositionRangeQuery result = new SpanPositionRangeQuery((SpanQuery) match.clone(), start, end);
        result.setBoost(getBoost());
        return result;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (!(o instanceof SpanPositionRangeQuery))
            return false;

        SpanPositionRangeQuery other = (SpanPositionRangeQuery) o;
        return this.end == other.end && this.start == other.start && this.match.equals(other.match) && this.getBoost() == other.getBoost();
    }

    @Override
    public int hashCode() {
        int h = match.hashCode();
        h ^= (h << 8) | (h >>> 25); // reversible
        h ^= Float.floatToRawIntBits(getBoost()) ^ end ^ start;
        return h;
    }

}